山东某细粒全尾砂胶结充填技术研究

以中钢集团山东富全矿业有限公司尾矿为原料,开展细粒全尾砂胶结充填技术研究。通过尾矿性质分析、尾矿胶结试验、料浆流动性试验等试验研究,查明了该尾矿基本性质,确定出适宜的胶凝材料种类、胶结工艺参数和输送工艺条件,同时对尾矿浓缩充填工艺进行了优化研究。     

流态胶凝材料胶结铁尾矿的充填性能研究

为实现用原状固废(钛石膏)的流态胶凝材料替代粉末胶凝材料进行铁尾矿胶结充填,简化胶凝材料制作流程,降低充填成本,采用流动度试验、强度试验和吸水率试验研究了两种胶凝材料胶结铁尾矿试样的宏观物理性能,并利用XRD和SEM对其胶结铁尾矿的固化机理进行了分析。研究结果表明:在尾矿固含量为70%、胶尾比为1∶10时,粉末胶凝材料胶结试样的3 d抗压强度(0.87 MPa)比流态胶凝材料约高出0.3 MPa,但两种胶凝材料胶结试样的7 d抗压强度差别在减小,28 d抗压强度并无明显差别。加入流态胶凝材料的充填尾矿流动度较加入粉末胶凝材料的充填尾矿提高了7.4%,既有利于泵送充填又不影响试样28 d的尾矿胶结体力学性能。XRD和SEM分析表明,流态胶凝材料的水化反应更有利于胶结体中钙矾石的生长。     

小官庄铁矿试验矿块胶结充填试验研究

对小官庄铁矿分级尾矿进行充填胶结试验。通过优选胶结材料,优化充填浓度和灰砂比,指导小官庄铁矿充填采矿生产。胶结试验结果表明,与普通水泥相比,胶固粉具有添加量少、胶结强度高等优点,应作为现场充填采矿的胶结材料;确定了充填浓度65%~70%、灰砂比1∶4的充填工艺参数,并在现场进行了成功应用。     

港里铁矿1号矿体全尾砂胶凝材料试验研究

港里铁矿1号矿体充填系统采用分级尾砂胶结充填工艺,因其能力不足、充填浓度低、充填体强度低等诸多问题,需升级改造。设计采用全尾砂结构流胶结充填工艺,而全尾矿粒度细且含泥量大严重影响充填体的强度。为此,矿山与长沙矿山研究院有限责任公司积极开展科研攻关,研制出了适用于该矿全尾砂充填的胶凝材料。     

β-半水磷石膏用做铁矿全尾胶结充填固料的研究

β-半水磷石膏作为气硬胶凝材料在建材上已获得广泛应用。研究了β-半水磷石膏的防水改性、凝结性能以及β-半水磷石膏的添加量对全尾矿充填材料性能的影响。结果表明,通过对其防水改性,胶凝材料的软化系数得以提高,其值达到0.82,砂浆的流动直径为150 mm,初终凝时间在2～8 h内可调。β-半水磷石膏和尾矿的质量比达到1∶7时,1,3,7 d的抗压强度分别达到0.65,0.75,1.30 MPa,用β-半水磷石膏制备的全尾胶结充填砂浆完全满足尾矿充填的工艺和性能指标要求。     

膏体—地聚物协同效应的铀尾矿井下充填处置体系构建

铀尾矿井下充填处置是铀矿“协同开采”理念的重要技术支撑,但铀尾矿复杂的物理化学性质影响了胶结充填体的固结固化特性,进而制约了铀尾矿骨料胶结充填技术的应用。基于膏体和地聚物特性的协 同效应,针对铀尾矿地表堆置和常规井下充填处置存在的问题,提出了基于地聚物分割包裹—膏体稳固协同固化的铀尾矿井下充填设想。铀尾矿井下胶结充填体的技术指标包括机械强度、化学稳定、抗浸出性、氡析 出率和增容特性,物料组成包括铀尾矿骨料、地聚物基材、矿黏合剂、外加剂、功能矿物和水等,制备与充填过程的关键工艺为铀尾矿颗粒级配重构、充填材料多元复配以及充填质量的原位监测与动态调整技术。以 某铀尾矿库尾砂、复配冶炼矿渣等材料为研究对象进行了验证试验,当水固比为0.25、灰砂比为1:4时,充填体试件在（20±1）℃、湿度≥95%条件下养护28 d后,试件的最大单轴抗压强度为17.65 MPa,表明基于地 聚物的铀尾矿膏体充填体制备具备可行性。该充填体系的构建对于促进膏体充填技术在低或极低放射性固体废弃物处置领域的应用具有一定的意义。     

全尾砂新型充填胶结材料性能试验和改进

针对传统尾矿胶结材料存在用量大、成本高及性能差等问题,试验以水淬渣和其它几种激发剂为胶结剂,以司家营铁矿全尾砂为骨料,制备新型胶结充填材料。在前期大量实验总结的胶结材料配比基础上,加入几种不同类型的减水剂,研究加入减水剂之后的新型胶结材料强度与流变特性的变化。结果表明:加入减水剂的胶结材料与之前的胶结材料相比,强度提高,流变特性增强,可以使矿山二步回采的充填更加高效和安全。     

锡矿山南矿尾矿膏体充填技术研究及工程应用

对锡矿山南矿尾矿进行了膏体制备和充填相关研究。该尾矿浓缩至质量浓度64%可达到膏体状态; 膏体尾矿以新型胶结粉为胶凝材料,在全尾砂浓缩膏体浓度68%、灰砂比1∶8条件下,充填体固结块28 d抗压强度可达3.36 MPa。工程应用实践表明,该尾矿膏体充填系统运行良好,工艺指标优良。     

矿山充填自动化控制技术的研究与应用

尾矿充填能够减少尾矿对地表的污染及提高对矿石的回采率,但高质量的尾矿胶结充填对工艺控制要求严格,人工难以操作完成。为切实解决尾矿充填中存在的控制问题,保障尾矿充填的质量,根据我国尾矿充填的工艺特点及现有条件对尾矿充填的控制技术进行了研究,并将研究技术多次运用于对尾矿充填的控制实现,从而获得了良好的控制效果,为相关应用提供了宝贵的借鉴经验。     

粘结性添加剂对分级尾矿充填料水力输送的影响

在某些地下采矿场支护作业中,胶结充填比普通分级尾矿水力充填优越,因为胶结充填泄出的水较少,而且早硬强度高。关于粘结性添加剂对充填料管道输送系统的影响。至今还未深入研究过。本文考察研究了粘结性添加剂对分级尾矿充填料水力输送性能的影响。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.